CN108471173A - Have both the wireless energy transfer system of constant pressure and constant current output - Google Patents
Have both the wireless energy transfer system of constant pressure and constant current output Download PDFInfo
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- CN108471173A CN108471173A CN201810366759.XA CN201810366759A CN108471173A CN 108471173 A CN108471173 A CN 108471173A CN 201810366759 A CN201810366759 A CN 201810366759A CN 108471173 A CN108471173 A CN 108471173A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J50/00—Circuit arrangements or systems for wireless supply or distribution of electric power
- H02J50/10—Circuit arrangements or systems for wireless supply or distribution of electric power using inductive coupling
- H02J50/12—Circuit arrangements or systems for wireless supply or distribution of electric power using inductive coupling of the resonant type
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Abstract
The wireless energy transfer system for having both constant pressure and constant current output belongs to wireless power transmission technical field.The present invention is to need to solve the problem of existing radio energy Transmission system in constant pressure and the transfer process of constant current output special controller to coordinate to realize and increase system complexity and increase loss.The input terminal of the output end connection multi-resonant primary side compensation topology of its variable ratio frequency changer inverter, the primary coil of the output end connection coupling mechanism of multi-resonant primary side compensation topology, the input terminal of the secondary coil output end connection multi-resonant pair side compensation topology of coupling mechanism, the input terminal of the output end connection rectification circuit of multi-resonant pair side compensation topology, the input terminal of the output end connection load of rectification circuit；The state recognition and frequency controller are used to detect the charged state of load, and the output frequency of variable ratio frequency changer inverter is controlled according to the charged state of load.The present invention is used for wireless energy transfer.
Description
Technical field
The present invention relates to the wireless energy transfer systems for having both constant pressure and constant current output, belong to wireless power transmission technology neck
Domain.
Background technology
Current wireless power transmission technology has application to numerous areas, such as mobile phone, robot, automatic guided vehicle are wirelessly
The load of charging equipment, these wireless charging systems is rechargeable battery.Currently, load is the wireless power transmission system of battery
System, there is a main difficult technicals for design.
The charging modes of battery are different from normal load, and general load is constant current or constant pressure powering mode, and is made with battery
System for load includes two kinds of charging processes of constant pressure and constant current simultaneously.By taking constant current turns constant-voltage charge as an example：First, using perseverance
Constant current charges to battery, and battery terminal voltage will be increased persistently at this time, and when reaching upper limit voltage, constant-current charging phase terminates；
After cell voltage reaches upper limit value, battery has been charged into about 85% electricity, hereafter, needs to continue to battery with constant voltage
It charges.When being charged to battery with constant voltage, cell voltage remains unchanged, and charging current will be gradually reduced, when its decline
When to a certain extent, battery is full of, and charging terminates.This charging process needs in the design of wireless charging system, increases multiple
Miscellaneous constant current turns constant-voltage charge controller, to monitor the charged state of battery in real time, to adjust system according to monitoring result
Charge mode.This not only adds the complexity of system, also add system loss, reduce system transfer efficiency.
In order to improve system power transformation efficiency and simplify control flow, wish that designing one kind can lead in practical application
System self-characteristic is crossed, to adjust the radio energy transmission system of the way of output.To improve system to variety classes, different shaped
Number load adaptability.That is wish that system itself can have both a variety of way of outputs, only need to change wherein a certain parameter,
The mutual conversion of constant pressure output and constant current output can be realized.
Invention content
The invention aims to solve existing radio energy Transmission system in constant pressure and the transfer process of constant current output
It middle the problem of needing special controller cooperation to realize, increase system complexity and increase loss, provides one kind and having both constant pressure
And the wireless energy transfer system of constant current output.
The wireless energy transfer system of the present invention for having both constant pressure and constant current output, it include variable ratio frequency changer inverter,
Multi-resonant primary side compensation topology, coupling mechanism, multi-resonant pair side compensation topology, rectification circuit and state recognition and FREQUENCY CONTROL
Device,
The input terminal of the output end connection multi-resonant primary side compensation topology of variable ratio frequency changer inverter, the compensation of multi-resonant primary side are opened up
The secondary coil output end connection multi-resonant pair side compensation of the primary coil for the output end connection coupling mechanism flutterred, coupling mechanism is opened up
The input terminal flutterred, the input terminal of the output end connection rectification circuit of multi-resonant pair side compensation topology, the output end of rectification circuit connect
Connect the input terminal of load；
The state recognition and frequency controller are used to detect the charged state of load, and according to the charged state control of load
The output frequency of variable ratio frequency changer inverter processed.
The multi-resonant primary side compensation topology includes LCC compensation topologies, LC compensation topologies or compound series and parallel topology
One of them.
Multi-resonant pair side compensation topology includes LCC compensation topologies, LC compensation topologies or compound series and parallel topology
One of them.
Advantages of the present invention：The wireless energy transfer system provided by the invention for having both constant pressure and constant current output, is suitable for
Determine the wireless power transmission of the coefficient of coup, phase of the constant voltage mode with constant current mode can be realized using power supply output frequency as variable
Mutually switching, adapts to turn constant-current charge process comprising constant pressure in charging process and constant current turns the system of constant-voltage charge process,
Working state of system is hardly influenced by load change in resistance.
In structure of the invention, by using multi-resonant compensation network so that system can under more resonant frequencies into
Row wireless power transmission passes through the switching of system operating frequency, you can changes system output pattern；It solves radio energy biography
In the design of defeated system, the adaptability problem of polymorphic type load, such as many types of load such as can adapt to battery, motor, resistance.
The present invention is suitable for the case where cell type loads, such as can be mobile phone wireless charging, robot and electronic vapour
Vehicle radio charging etc., it reduces the complexity of charging system control, simplifies circuit system, can improve wireless power transmission
The charge efficiency of system.
Description of the drawings
Fig. 1 is the functional block diagram of the wireless energy transfer system of the present invention for having both constant pressure and constant current output；
Fig. 2 is the exemplary circuit figure that the present invention uses LCC-LCC compensation network structures；
Fig. 3 is the equivalent circuit diagram of Fig. 2；
Fig. 4 is the exemplary circuit figure that the present invention uses LCC-LC compensation network structures；
Fig. 5 is the exemplary circuit figure that the present invention uses LCC-PS compensation network structures；
Fig. 6 is the exemplary circuit figure that the present invention uses SP-LCC compensation network structures；
Fig. 7 is the exemplary circuit figure that the present invention uses SP-LC compensation network structures；
Fig. 8 is the exemplary circuit figure that the present invention uses SP-PS compensation network structures；
Fig. 9 is that the present invention gives instructions by telegraph a circuit diagram using LC-LCC compensation network structures；
Figure 10 is the exemplary circuit figure that the present invention uses LC-PS compensation network structures；
Figure 11 is the relational graph of power supply coefficient of coup k and transimission power (unit W) under different operating frequency；
S represents cascaded structure in description of the drawings, and P represents parallel-connection structure；Abbreviation SP or PS structure.
Specific implementation mode
The specific implementation mode of the present invention is described in detail below in conjunction with the accompanying drawings, but the present invention is not by embodiment
Limitation：
In conjunction with shown in Fig. 1, the wireless energy transfer system of constant pressure and constant current output is had both, it includes variable ratio frequency changer inverter
1, multi-resonant primary side compensation topology 2, coupling mechanism 3, multi-resonant pair side compensation topology 4, rectification circuit 5 and state recognition and frequency
Controller 6,
The input terminal of the output end connection multi-resonant primary side compensation topology 2 of variable ratio frequency changer inverter 1, the compensation of multi-resonant primary side
The primary coil of the output end connection coupling mechanism 3 of topology 2, the secondary coil output end connection multi-resonant pair side of coupling mechanism 3
The input terminal of compensation topology 4, the input terminal of the output end connection rectification circuit 5 of multi-resonant pair side compensation topology 4, rectification circuit 5
Output end connection load 7 input terminal；
The state recognition and frequency controller 6 are used to detect the charged state of load 7, and according to the charging shape of load 7
State controls the output frequency of variable ratio frequency changer inverter 1.
The multi-resonant primary side compensation topology 2 is set to the primary side winding end of coupling mechanism 3, and the compensation of multi-resonant pair side is opened up
Flutter the 4 secondary windings ends for being set to coupling mechanism 3；The load 7 can be battery, motor or resistance.
The multi-resonant primary side compensation topology 2 includes LCC compensation topologies, LC compensation topologies or compound series and parallel topology
One of them.
Multi-resonant pair side compensation topology 4 includes LCC compensation topologies, LC compensation topologies or compound series and parallel topology
One of them.
The LCC compensation topologies include the first inductance, the first capacitance and the second capacitance；If LCC compensation topologies are multi-resonant
Primary side compensation topology 2, then the first output end of one end connection variable ratio frequency changer inverter 1 of the first inductance, the first inductance it is another
One end of the first capacitance of end connection, the second output terminal of the other end connection variable ratio frequency changer inverter 1 of the first capacitance；
The other end of first inductance connects one end of the second capacitance, and the other end of the second capacitance connects 3 primary side of coupling mechanism
One end of coil, the second output terminal of the other end connection variable ratio frequency changer inverter 1 of 3 primary coil of coupling mechanism；
If LCC compensation topologies are multi-resonant pair side compensation topology 4, the of one end connection rectification circuit 5 of the first inductance
One input terminal, the other end of the first inductance connect one end of the first capacitance, and the of the other end connection rectification circuit 5 of the first capacitance
Two input terminals；
The other end of first inductance connects one end of the second capacitance, the 3 secondary side of other end connection coupling mechanism of the second capacitance
One end of coil, the second input terminal of the other end connection rectification circuit 5 of 3 secondary coil of coupling mechanism.
The LC compensation topologies include the second inductance and third capacitance；
If LC compensation topologies are multi-resonant primary side compensation topology 2, one end connection variable ratio frequency changer inverter 1 of the second inductance
The first output end, the second inductance the other end connection third capacitance one end, third capacitance the other end connection variable ratio frequency changer it is inverse
The second output terminal of variable power source 1；
LC compensation topologies and the primary coil of coupling mechanism 3 constitute LCL emitting structurals；
If LC compensation topologies are multi-resonant pair side compensation topology 4, the first of one end connection rectification circuit 5 of the second inductance
Input terminal, one end of the other end connection third capacitance of the second inductance, the second of the other end connection rectification circuit 5 of third capacitance
Input terminal；
The secondary coil of LC compensation topologies and coupling mechanism 3 constitutes LCL and receives structure.
The compound series and parallel topology includes third inductance, the 4th capacitance and the 5th capacitance；
If compound series and parallel topology is multi-resonant primary side compensation topology 2, one end of third inductance connects variable ratio frequency changer
First output end of inverter 1, the other end of third inductance connect one end of the 4th capacitance, the other end connection of the 4th capacitance
One end of 5th capacitance, the second output terminal of the other end connection variable ratio frequency changer inverter 1 of the 5th capacitance；
5th capacitance is in parallel with the primary coil of coupling mechanism 3；
If compound series and parallel topology is multi-resonant pair side compensation topology 4, one end of third inductance connects rectified current
The first input end on road 5, the other end of third inductance connect one end of the 4th capacitance, the 5th electricity of other end connection of the 4th capacitance
One end of appearance, the second input terminal of the other end connection rectification circuit 5 of the 5th capacitance；
5th capacitance is in parallel with the secondary coil of coupling mechanism 3.
In conjunction with shown in Fig. 2 and Fig. 3, by taking the electric energy transmission system based on bilateral LCC compensation networks structure as an example, the multi resonant
Primary side of shaking compensation topology 2 uses LCC compensation topologies, while multi-resonant pair side compensation topology 4 uses LCC compensation topologies；
It includes inductance L to set primary side LCC compensation topologiesp1, capacitance Cp1With capacitance Cp2, by capacitance Cp1As the first electricity of primary side
Hold；Secondary side LCC compensation topologies include inductance Ls1, capacitance Cs1With capacitance Cs2, by capacitance Cs1As the first capacitance of secondary side；Coupling machine
3 primary coil L of structurep2Connect a resonant capacitive element Cp2, and Lp2With Cp2The cascaded structure of composition and capacitance Cp1Constitute one
A primary parallel resonant cavity, the parallel resonance chamber and resonance compensation inductance Lp1Series connection, and Lp1With UPSeries connection, as shown in Figure 3；Institute
State parallel resonance chamber, resonance compensation inductance Lp1And UPForm closed circuit；3 secondary coil L of coupling mechanisms2One resonance electricity of series connection
Hold element Cs2, and Ls2With Cs2The cascaded structure of composition and capacitance Cs1Constitute a secondary parallel resonant cavity, the parallel resonance chamber
With resonance compensation inductance Ls1Series connection, and Ls1With equivalent load RLSeries connection, as shown in Figure 3；The parallel resonance chamber, resonance compensation
Inductance Ls1And equivalent load RLForm closed circuit.
Then the constraints of bilateral LCC compensation networks structure includes：
Wherein λpFor capacitance Cp1With capacitance Cp2Capacity ratio：λsFor capacitance Cs1With capacitance Cs2Capacity ratio：
The output frequency of variable ratio frequency changer inverter 1 includes：
Wherein ω1For the power supply output frequency of constant current output pattern, ω2For the power supply output frequency of constant pressure output mode；
Coupling mechanism 3 set work coefficient of coup k as：
Wherein RLIndicate load.
When system is constant current output pattern：
Wherein ILFor the system output current of constant current output pattern, UpFor the modulation voltage value of variable ratio frequency changer inverter 1, P1
For the system output power of constant current output pattern.
In constant current output pattern, the output current value of system is unrelated with load.
When system is constant pressure output mode：
ULFor the system output voltage of constant pressure output mode, P2For the system output power of constant pressure output mode.
In constant pressure output mode, the output voltage values of system are unrelated with load.
When load charging process is to be converted to the operating mode of constant-current charge by constant-voltage charge：
During constant-voltage charge, it is ω to make 1 output frequency of variable ratio frequency changer inverter2；State recognition and frequency controller 6
By electric current and the charged state of voltage sensor monitoring load 7, when load charging current reaches threshold current, output is high
For level pumping signal to variable ratio frequency changer inverter 1, it is ω to make 1 output frequency of variable ratio frequency changer inverter1, into constant-current charge；
When load charging process is to be converted to the operating mode of constant-voltage charge by constant-current charge：
During constant-current charge, it is ω to make 1 output frequency of variable ratio frequency changer inverter1；State recognition and frequency controller 6
By electric current and the charged state of voltage sensor monitoring load 7, when load charging voltage reaches threshold voltage, output is low
For level pumping signal to variable ratio frequency changer inverter 1, it is ω to make 1 output frequency of variable ratio frequency changer inverter2, into constant-voltage charge.
The high level pumping signal or low level pumping signal can come from voltage controlled oscillator, high level pumping signal
Or the correspondence of low level pumping signal and power supply output frequency can regard actual conditions and be freely combined, and be obtained from system pair side
The data such as voltage, electric current state recognition and the FREQUENCY CONTROL of system primary side can be passed to by way of WIFI and bluetooth
Device 6.
The present invention in actual use, what multi-resonant primary side compensation topology 2 and multi-resonant pair side compensation topology 4 specifically used
Structure, such as LCC compensation topologies, LC compensation topologies or compound series and parallel are opened up, and can be combined as needed, such as can
Think that Fig. 4 to combination shown in Fig. 10, can also carry out the combination of other forms as needed.
As shown in figure 11, when the coefficient of coup of coupling mechanism 3 is two intersections of complex curve in figure, system may be implemented with identical
Power switching working mode, i.e. handoff procedure will not affect greatly system stability, steadily realize transition.
The present invention specific design procedure can be：
Step 1：Load such as load characteristic of the battery when constant pressure turns constant current is obtained, including resistance value；
Step 2：When obtaining constant pressure or constant-current charge, the rated voltage or rated current of system；
Step 3：Obtain the coefficient of coup under 3 rated operation of coupling mechanism；
Step 4：Determine each component in system, such as parameter inductively or capacitively；
Step 5：It chooses respective sensor and design point identifies and frequency controller；
Step 6：The operating frequency range of inverter is set according to design work frequency range；
Step 7：Rectifier bridge is designed according to the working condition of load, so that rectifier bridge meets the operating current of load；
Step 8：Electromagnetic shielding work is carried out to related circuit.
Although the present invention is disclosed as above with preferred embodiment, it is not limited to the present invention, any to be familiar with this
The people of technology can do various changes and modification, therefore the protection of the present invention without departing from the spirit and scope of the present invention
Range should be subject to what claims were defined.
Claims (10)
1. a kind of wireless energy transfer system having both constant pressure and constant current output, which is characterized in that it includes variable ratio frequency changer inversion electricity
Source (1), multi-resonant primary side compensation topology (2), coupling mechanism (3), multi-resonant pair side compensation topology (4), rectification circuit (5) and shape
State identifies and frequency controller (6),
The input terminal of the output end connection multi-resonant primary side compensation topology (2) of variable ratio frequency changer inverter (1), the compensation of multi-resonant primary side
The secondary coil output end of the primary coil of the output end connection coupling mechanism (3) of topological (2), coupling mechanism (3) connects multi resonant
Shake the input terminal of secondary side compensation topology (4), the input of the output end connection rectification circuit (5) of multi-resonant pair side compensation topology (4)
End, the input terminal of the output end connection load (7) of rectification circuit (5)；
The state recognition and frequency controller (6) are used to detect the charged state of load (7), and according to the charging of load (7)
State controls the output frequency of variable ratio frequency changer inverter (1).
2. the wireless energy transfer system according to claim 1 for having both constant pressure and constant current output, which is characterized in that described
Multi-resonant primary side compensation topology (2) includes one of LCC compensation topologies, LC compensation topologies or compound series and parallel topology.
3. the wireless energy transfer system according to claim 2 for having both constant pressure and constant current output, which is characterized in that described
Multi-resonant pair side compensation topology (4) includes one of LCC compensation topologies, LC compensation topologies or compound series and parallel topology.
4. the wireless energy transfer system according to claim 3 for having both constant pressure and constant current output, which is characterized in that described
LCC compensation topologies include the first inductance, the first capacitance and the second capacitance；
If LCC compensation topologies are multi-resonant primary side compensation topology (2), one end of the first inductance connects variable ratio frequency changer inverter
(1) the first output end, the other end of the first inductance connect one end of the first capacitance, and the other end of the first capacitance connects variable ratio frequency changer
The second output terminal of inverter (1)；
The other end of first inductance connects one end of the second capacitance, and the other end of the second capacitance connects coupling mechanism (3) primary side line
One end of circle, the second output terminal of the other end connection variable ratio frequency changer inverter (1) of coupling mechanism (3) primary coil；
If LCC compensation topologies are multi-resonant pair side compensation topology (4), the of one end connection rectification circuit (5) of the first inductance
One input terminal, the other end of the first inductance connect one end of the first capacitance, the other end connection rectification circuit (5) of the first capacitance
Second input terminal；
The other end of first inductance connects one end of the second capacitance, the secondary sideline of other end connection coupling mechanism (3) of the second capacitance
One end of circle, the second input terminal of the other end connection rectification circuit (5) of coupling mechanism (3) secondary coil.
5. the wireless energy transfer system according to claim 3 for having both constant pressure and constant current output, which is characterized in that described
LC compensation topologies include the second inductance and third capacitance；
If LC compensation topologies are multi-resonant primary side compensation topology (2), one end connection variable ratio frequency changer inverter (1) of the second inductance
The first output end, the second inductance the other end connection third capacitance one end, third capacitance the other end connection variable ratio frequency changer it is inverse
The second output terminal of variable power source (1)；
LC compensation topologies and the primary coil of coupling mechanism (3) constitute LCL emitting structurals；
If LC compensation topologies are multi-resonant pair side compensation topology (4), the first of one end connection rectification circuit (5) of the second inductance
Input terminal, one end of the other end connection third capacitance of the second inductance, the of the other end connection rectification circuit (5) of third capacitance
Two input terminals；
The secondary coil of LC compensation topologies and coupling mechanism (3) constitutes LCL and receives structure.
6. the wireless energy transfer system according to claim 3 for having both constant pressure and constant current output, which is characterized in that described
Compound series and parallel topology includes third inductance, the 4th capacitance and the 5th capacitance；
If compound series and parallel topology is multi-resonant primary side compensation topology (2), one end connection variable ratio frequency changer of third inductance is inverse
First output end of variable power source (1), the other end of third inductance connect one end of the 4th capacitance, the other end connection of the 4th capacitance
One end of 5th capacitance, the second output terminal of the other end connection variable ratio frequency changer inverter (1) of the 5th capacitance；
5th capacitance is in parallel with the primary coil of coupling mechanism (3)；
If compound series and parallel topology is multi-resonant pair side compensation topology (4), one end of third inductance connects rectification circuit
(5) first input end, the other end of third inductance connect one end of the 4th capacitance, the 5th electricity of other end connection of the 4th capacitance
One end of appearance, the second input terminal of the other end connection rectification circuit (5) of the 5th capacitance；
5th capacitance is in parallel with the secondary coil of coupling mechanism (3).
7. the wireless energy transfer system according to claim 4 for having both constant pressure and constant current output, which is characterized in that described
Multi-resonant primary side compensation topology (2) uses LCC compensation topologies, while multi-resonant pair side compensation topology (4) is opened up using LCC compensation
It flutters；
It includes inductance L to set primary side LCC compensation topologiesp1, capacitance Cp1With capacitance Cp2, by capacitance Cp1As the first capacitance of primary side；It is secondary
Side LCC compensation topologies include inductance Ls1, capacitance Cs1With capacitance Cs2, by capacitance Cs1As the first capacitance of secondary side；
Then the constraints of bilateral LCC compensation networks structure includes：
Wherein λpFor capacitance Cp1With capacitance Cp2Capacity ratio, λsFor capacitance Cs1With capacitance Cs2Capacity ratio；
The output frequency of variable ratio frequency changer inverter (1) includes：
Wherein ω1For the power supply output frequency of constant current output pattern, ω2For the power supply output frequency of constant pressure output mode；
Coupling mechanism (3) set work coefficient of coup k as：
Wherein RLIndicate load.
8. the wireless energy transfer system according to claim 7 for having both constant pressure and constant current output, which is characterized in that
When system is constant current output pattern：
Wherein ILFor the system output current of constant current output pattern, UpFor the modulation voltage value of variable ratio frequency changer inverter (1), P1For
The system output power of constant current output pattern.
9. the wireless energy transfer system according to claim 8 for having both constant pressure and constant current output, which is characterized in that
When system is constant pressure output mode：
ULFor the system output voltage of constant pressure output mode, P2For the system output power of constant pressure output mode.
10. the wireless energy transfer system according to claim 9 for having both constant pressure and constant current output, which is characterized in that
When load charging process is to be converted to the operating mode of constant-current charge by constant-voltage charge：
During constant-voltage charge, it is ω to make variable ratio frequency changer inverter (1) output frequency2；State recognition and frequency controller (6)
Pass through electric current and the charged state of voltage sensor monitoring load (7), when load charging current reaches threshold current, output
High level pumping signal gives variable ratio frequency changer inverter (1), and it is ω to make variable ratio frequency changer inverter (1) output frequency1, filled into constant current
Electricity；
When load charging process is to be converted to the operating mode of constant-voltage charge by constant-current charge：
During constant-current charge, it is ω to make variable ratio frequency changer inverter (1) output frequency1；State recognition and frequency controller (6)
Pass through electric current and the charged state of voltage sensor monitoring load (7), when load charging voltage reaches threshold voltage, output
Low level pumping signal gives variable ratio frequency changer inverter (1), and it is ω to make variable ratio frequency changer inverter (1) output frequency2, filled into constant pressure
Electricity.
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| CN109217496A (en) * | 2018-10-10 | 2019-01-15 | 武汉理工大学 | The parameters analysis method of bilateral LCC compensation circuit in radio energy transmission system |
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| CN111146872A (en) * | 2019-12-31 | 2020-05-12 | 华为技术有限公司 | Wireless power transmission system |
| CN111431297A (en) * | 2020-04-25 | 2020-07-17 | 哈尔滨工业大学 | Multi-relay multi-load bidirectional wireless power transmission system with strong anti-offset performance |
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| WO2021120726A1 (en) * | 2019-12-17 | 2021-06-24 | 华为技术有限公司 | Wireless charging transmitting end and receiving end, methods therefor, and wireless charging system |
| CN113972756A (en) * | 2021-11-19 | 2022-01-25 | 宁波道充科技有限公司 | Compensation circuit structure suitable for wireless charging coil of big skew |
| CN113972755A (en) * | 2021-11-19 | 2022-01-25 | 宁波道充科技有限公司 | Compensation structure of wireless charging primary coil capable of being automatically turned off |
| CN114142627A (en) * | 2021-12-14 | 2022-03-04 | 西南交通大学 | Wireless power transmission system |
| CN114531051A (en) * | 2021-03-23 | 2022-05-24 | 张朝辉 | Wireless charging power converter and standardized decoupling design method thereof |
| CN116094192A (en) * | 2023-03-24 | 2023-05-09 | 西安霍威电源有限公司 | Multipath wireless power transmission system for realizing constant current output |
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